package day02;

public class Demo02 {
    public static void main(String[] args) {
        int a = 5;
        {
            int b = 6;
            System.out.println(b);
        }
        //System.out.println(b);
        Koo k1 = new Koo();
        Koo k2 = new Koo();
        k1 = null;
        k2 = null;
        System.gc();
        System.out.println(Koo.k);
    }
}
class Koo{
    int x = 5;
    static int k = 19;
}
